import scrapy

class QuotesSpider(scrapy.Spider):
    name = "quotes"
    start_urls=[
        'http://quotes.toscrape.com/tag/humor/'
    ]

    def parse(self, response):
        for quote in response.css("div.quote"):
            yield {
                'text':quote.css('span.text::text').extract_first(),
                'author':quote.xpath('span/small/text()').extract_first()
            }
        next_page = response.css('li.next a::attr("href")').extract_first()
        if next_page is not None:
            next_page = response.urljoin(next_page)
            yield scrapy.Request(next_page,callback=self.parse)